Car Key Replacement · Spare Keys · Key Fob Replacement · Transponder & Chip Keys · Remote & Smart Keys · Push-Start Coding · All-Keys-Lost · Car Lockout
We pull right into your own driveway — a colonial off Meriam Hill, a home near the Battle Green, a family house out by Five Forks — and program car keys and key fobs for every make and model, domestic, Asian and European alike. No dealer appointment, no hours in a waiting room.
Hourly rate from $100. Quote confirmed before any work starts. We program every make in Lexington — here's how pricing breaks down:
Lost every key, and the car's sitting in the driveway near Lexington Center going nowhere? Dealer estimates $500–$900 for a single replacement — before you figure out how to get an undrivable car there in the first place. We come to your home, generate a new key on-site through the immobilizer module, and you drive straight off your own driveway.
That second or third family car came with only one key from the previous owner? We add a backup before the “what if we lose it” turns into a stranded morning. Common for Lexington households running a used Honda, Subaru, Toyota, BMW or Audi as the kid's car or the commuter that only ever had a single fob.
Need a car key replacement in Lexington? A worn Mercedes chrome fob falling apart, a BMW display key that won't hold a charge, a snapped Audi switchblade, a cracked Toyota or Honda smart key, a lost remote? We cut and program a replacement key or fob, move over or renew the chip, and re-sync it to your immobilizer in the driveway — original-grade keys that handle push-start, comfort-access and trunk release exactly like factory.
The car throws “Key not detected” before the Hartwell Ave commute, or it cranks but won't catch on a cold Meriam Hill morning? That's the immobilizer talking to the security module — data-level work, not key cutting. We read the fault, re-pair the transponder, and you're moving again before your coffee's cold.
Most locksmiths serving Lexington cover basic chip keys and remote duplication — that's where we differ. Boston ECU Lab uses OEM-grade tools (ISTA, Star Diagnosis, PIWIS, ODIS, IDS, GDS2, wiTECH) to handle exactly what locksmiths typically refer out to the dealer — the modern push-start and immobilizer work behind the wheel of Lexington's family cars and commuter fleet, domestic, Asian and European alike:
The hardest call we get, and our specialty. Toyota/Honda smart-key all-keys-lost, Ford PATS, plus BMW CAS4 / FEM-BDC, Mercedes FBS4, Audi IMMO5 / Kessy, Porsche PIWIS-required and Range Rover KVM. When no working key exists and the immobilizer is locked, locksmiths send you to the dealer — we read the module directly and generate a new key right in your Lexington driveway.
Did a Lexington or Arlington repair shop swap your DME, FEM, EZS or steering lock, and now the car won't crank? Replacement modules ship locked — they need virgin coding married to your VIN and immobilizer first. No locksmith has the tooling for that; we arrive with the dealer's own software and finish the job the shop started.
A fob that works fine all summer but ghosts on a cold Follen Hill morning, or a no-start that comes and goes? Intermittent immobilizer and transponder faults are maddening — and pure data work inside the security module, not a key-cutting job. We diagnose the actual fault and re-sync it instead of just throwing an expensive new key at the problem.
Sourced a used DME, BDC or instrument cluster to keep an older car on the road affordably? That part still carries the donor vehicle's VIN and immobilizer data — it has to be cloned to your car's identity before it will run. It's deep module work most Lexington-area shops and locksmiths won't touch — we handle it right in your driveway.
Quick turnaround, standard transponder & smart-key programming using factory-grade equipment — the Subarus, Toyotas, Hondas and Fords that fill Lexington's two-car driveways and school-run routines.
Common Lexington jobs: 2019–2024 Subaru Outback proximity key · 2020+ Honda Pilot immobilizer sync · 2020+ Toyota Highlander smart key · 2019+ Honda CR-V fob · 2018–2024 Ford Explorer PATS key · 2020+ Mazda CX-9 smart key · 2020+ Toyota RAV4 smart key · 2020+ Kia Telluride smart key
The work most locksmiths refer out. We run the dealer's own tools (ISTA, Star Diagnosis, PIWIS, ODIS) in your Lexington driveway, without the dealer's markup or the trip to the service counter.
Common Lexington jobs: 2017–2024 BMW X5/X3 CAS4/FEM keys · 2018+ Mercedes GLC/E-Class FBS4 · 2020+ Audi Q5/A6 MQB IMMO5 · 2016+ Porsche Cayenne/Macan PIWIS coding · 2018+ Range Rover Sport KVM cloning · 2019+ Volvo XC90/XC60 smart key
Going to the dealer for a key isn't just the key cost. Add the tow if no key works, the hours you take off to be there, and the drive each way. Here's what one job actually costs a Lexington driver:
| Cost item | Dealer | Boston ECU Lab |
|---|---|---|
| Key + programming | $400 – $900 | From $100 |
| Tow truck (no working key) | $200 – $400 | $0 — we come to your driveway |
| Round trip up Route 128 | $25 – $50 gas + time | $0 |
| Time spent at dealer | 4 – 6 hours | 30 – 90 min |
| Time off work | Half-day PTO | None — we come evening or before work |
| Total cost | $625 – $1,350+ | $100 – $400 |
Lexington runs from the historic Battle Green and the Center out to the Hartwell Ave lab district and the Route 128 corridor — colonials on Meriam Hill, family homes around Five Forks, the Countryside off Route 2A, the quiet side streets of the Manor. Wherever your car sits in the driveway or garage, we come to it.
Lexington is a busy family town stretched from the Battle Green and Mass Ave out to the Hartwell Ave labs — multi-car households, top-rated schools, and packed weekday schedules. A car stranded in the driveway plus a round trip to the dealer can swallow an entire afternoon. We program every make right where the car sits, so a lost key never costs you a day. Here's why mobile programming fits Lexington specifically:
In an affluent family town like Lexington, the car's already home in the driveway — the dealer is the part that's inconvenient. A no-key situation usually means hauling the car off and clearing your calendar to sit and wait. We skip all of it: we pull into your driveway, program the key on the spot, and your schedule stays yours.
Plenty of Lexington heads to the Hartwell Ave labs, the schools, or the train each morning — a dead fob at 7am or a no-start before an early meeting is the last thing you have time for. We run early-morning, evening and weekend slots so a key problem never costs you a shift.
Lexington households often run two or three cars — and the used commuter or the kid's car frequently came with only one key from the previous owner. Lose that one and the household is short a car; a dealer spare means an appointment you have to drive to and wait out. We add the backup key in your driveway in under an hour, before the one-key problem becomes a crisis.
Lexington, Arlington and Bedford independent repair shops are excellent mechanics — but most don't carry ISTA, PIWIS, ODIS or wiTECH for immobilizer and module coding. When a repair needs a module coded to the car or a key paired after the work, they call us. Ask your shop; there's a good chance they already know us.
“Our son's Honda came with one key and we finally wanted a spare before he left for school. The dealer wanted us to drive up to Burlington and wait. Boston ECU Lab just pulled into our driveway off Meriam Hill and coded the smart key in about 40 minutes. So much easier than losing a Saturday.”
“Lost every key to the X5 the morning of an early Hartwell Ave meeting — car dead in the driveway. BMW dealer quoted $580 plus a tow up 128. These guys came to the house, read the FEM module and cut a new key in under an hour. Half the cost and I never left Lexington.”
“Push-start on the Outback stopped recognizing the fob on a cold morning near Five Forks — wouldn't even unlock. I figured it meant hauling it in and a long dealer wait. They re-synced the smart key right in the driveway for a flat rate. Quick, honest, exactly what they quoted.”
Tell us your make, year and situation — we'll pull into your driveway anywhere from Lexington Center to Hartwell Ave with a firm price upfront.